Why it is pointless to have Xapo and Coinmama accounts

I registered with Xapo and Coinmama and did not use it for a long time.

Both are utterly useless, since all you can do is buy Bitcoin (only). XAPO is also not at all secure since it doesn’t use an independent authentication application like Authy. Instead, it uses its own mobile app and FORCES you to use your phone number in order to activate the mobile app. Now, it is well known that phone numbers can be easily hijacked, so that doesn’t make any sense. Also, it makes it impossible to use Xapo while travelling across the world.